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Z8631904PSC Datasheet(PDF) 10 Page - Zilog, Inc. |
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Z8631904PSC Datasheet(HTML) 10 Page - Zilog, Inc. |
10 / 23 page Z86319 PS/2 Mouse Controller Zilog 10 P R E L I M I N A R Y DS97KEY1605 PIN FUNCTIONS (Continued) Port 2 (P27-P20). Port 2 is an 8-bit, bit programmable, bi- directional, CMOS-compatible I/O port. These eight I/O lines can be configured under software control to be input or output, independently. Bits programmed as outputs may be globally programmed as either push-pull or open- drain. When configured as inputs, P20 and P22 have 10 kOhm (typical) pull-up resistors (Figure 9). However, P21 and P23 do not have resistors (Figure 10). When configured as inputs, P24-P27 are configured with a voltage divider. The voltage divider consists of an internal 25K pull-up resistor (Figure 11), and a 7.5K pull-down re- sistor. The input levels on P24-P27 are adjusted for con- nection to the emitters of the opto-transistors and switch at a voltage level of 0.4 VDD (± 300 mV). For input voltages on P24-P27, refer to Table 3. Table 3. P24-P27 Input Open Circuit Voltage (No off-chip resistance) VDD Min Max 4.5V 0.95V 1.15V 5.0V 1.05V 1.25V 5.5V 1.15V 1.39V Figure 9. Port 2 P20, P22 Configuration OE Out In Open-Drain VDD Pad 10 Kohm, ±20% |
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